Polypropylene-based wrap film

Abstract

An object of the invention is to provide a non-chlorine polypropylene wrap film excellent in adhesion, transparency, heat resistance, flexibility, gas barrier properties, touch and cutting properties, and disclosed is a polypropylene wrap film, a multilayer film having a tensile modulus of 200 to 1,000 MPa, containing at least a surface layer and an inner layer having a gas barrier resin, and being stretched into a twice or more length in a machine direction and / or a transverse direction, wherein in its multilayer constitution, the surface layer is constituted by a composition comprising, for example, a mixture of a polypropylene resin, a softening agent, an adhering agent and a liquid adhering assistant at a suitable mixing ratio, and the inner layer is constituted, for example, by an ethylene-vinyl alcohol copolymer resin.

Description

TECHNICAL FIELD The present invention relates to a film for packaging goods, etc., for example, a film used for a food packaging wrap at home. In particular, the invention relates to a polypropylene wrap film having gas barrier properties, and further excellent in adhesion, transparency, heat resistance, feel such as anti-drape stiffness and stiffness, etc. BACKGROUND ART When foods are stored in food business such as restaurants and food shops, and in the general home, and further, when foods are heated in microwave ovens, thin thermoplastic resin films have hitherto been used. Of these, food packaging wrap films of the vinylidene chloride copolymer resin family combine excellent properties such as moisture resistance, oxygen gas barrier properties, heat resistance, adhesion to containers, etc. and transparency, so that they are in heavy usage as food packaging wrap films. Further, in recent years, food packaging wrap films comprising non-chlorine resins have also variously been...

AI Technical Summary

Benefits of technology

is to provide a non-chlorine resin film useful as a packaging film, which is improved in gas barrier properties and adhesion even when a polypropylene resin poor in gas barrier properties and adhesion is used, and further takes ease of use into account, in order to solve such problems.

Problems solved by technology

The polyolefin resins such as the polypropylene resin are poor in gas barrier properties, and adhesion on surfaces of the films is also scarcely observed, so that adhesion performance indispensable as the food packaging wrap films is insufficient.

However, they have been inferior to the above-mentioned wrap films of the vinylidene chloride copolymer resin family in terms of gas barrier properties and adhesion to containers.

However, none of them provide satisfactory films.

However, the liquid polybutene is a liquid, so that mixing thereof with the polyolefin resin results in softening of the film to cause loss of anti-drape stiffness and stiffness.

Accordingly, when the film is cut, it becomes easy to cling to fingers or goods to be packaged, resulting in unavailability thereof as a packaging film.

However, this pursues good cutting properties, so that no softening agent is contained in the film.

In this technique, the problems of the softened film and difficulty in handling at the time when the film is cut have also been left.

Images